偏振无关高吸收效率宽吸收带宽超材料吸收器  

Polarization Independent High Absorption Efficiency Wide Absorption Bandwidth Metamaterial Absorber

作　　者：王超素 江达飞[1] 江孝伟 Wang Chaosu;Jiang Dafei;Jiang Xiaowei(College of Information Engineering,Quzhou College of Technology,Quzhou,Zhejiang 324000,China;Key Laboratory of Opto-electronics Techyiology,Ministry of Education,Beijing University of Technology,Beijing 100124,China)

机构地区：[1]衢州职业技术学院信息工程学院,浙江衢州324000 [2]北京工业大学光电子技术教育部重点实验室,北京100124

出　　处：《激光与光电子学进展》2020年第3期180-185,共6页Laser & Optoelectronics Progress

基　　金：国家自然科学基金(61575008,61650404);2019年衢州市指导性项目(2019008)。

摘　　要：基于表面等离子体慢光波导原理,利用介质硅(介质层)和金属金(金属层)设计出在整个近红外波段有高吸收效率的超材料吸收器。经过模拟计算发现设计的超材料吸收器在金属层厚度和介质层厚度分别为0.04μm和0.02μm时光吸收带宽最大,且波导层宽度和吸收器层数对吸收带宽也有较大影响。在TM偏振态下,光入射角小于40°时,计算得出超材料吸收器在整个近红外波段可以保持90%以上的吸收效率,而且在垂直入射条件下对TE和TM偏振具有相同的吸收效率,这体现了设计的超材料吸收器具有偏振无关的特性。Based on the principle of surface plasmon slow optical waveguide,a metamaterial absorber with high absorption efficiency in the whole near infrared band is designed by using dielectric silicon(dielectric layer)and Au(metal layer).The simulation results show that the bandwidth of the absorber is the largest when the thicknesses of the metal layer and the dielectric layer are 0.04μm and 0.02μm,respectively.It is also found that the width of the waveguide layer and the number of absorber layers have great influence on the absorption bandwidth.Finally,it is calculated that the absorption efficiency of the metamaterial absorber can be maintained over 90%in the whole near infrared band when the incident angle of light is below 40°under TM polarization.Moreover,the absorption efficiency for TE and TM polarizations is equal at normal incidence,which shows that the metamaterial absorber designed in this paper is polarization independent.

关 键 词：材料 超材料 吸收器 近红外 偏振无关 

分 类 号：TN304[电子电信—物理电子学]